Swapping Drayton RTS1 for digital thermostat - Wiring question

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Hi all.

Im trying to replace my Drayton RTS1 with a digital thermostat. I can get power just fine, but I can't for the life of me figure out where terminal 3 on the existing block should be wired to on the digital thermostat.

See below pictures. (this is for heating only, as water is controlled by another unit in my kitchen).

20200316_213424.jpg 20200316_213504.jpg

Can anyone suggest how to proceed? Please.

Thank you

Tom
 
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Connect the yellow wire to terminal 2 on your new thermostat, you will also need a short length of wire to link terminals 1 and 4.
You will need to set your existing programmer so that heating is on constant for the new thermostat to work correctly.
 
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